mount command

Synopsis

mount [<dev> <mountpoint>]
mount <iface> <dev:part> <mountpoint>
mount -t <type> <iface> <dev:part> <mountpoint>

Description

The mount command attaches a filesystem to the VFS namespace at the given mount point. On first use the VFS is automatically initialised with an empty root filesystem at /.

Without arguments, lists all current mounts showing the mount point and the name of the UCLASS_FS device.

With two arguments, mounts the named UCLASS_FS device at mountpoint.

With three arguments, auto-detects the filesystem type on the block device and mounts it. Each registered VFS filesystem driver is tried in turn until one succeeds.

With -t, specifies the filesystem type explicitly instead of auto-detecting.

The mount command is also available as fs mount; see fs command.

dev: name of a UCLASS_FS device (e.g. hostfs for the sandbox host filesystem)
mountpoint: absolute path where the filesystem should appear (must start with /)
iface: block device interface (e.g. host, mmc, scsi)
dev:part: device and partition number (e.g. 0:0, 0:1)
type: filesystem type (e.g. ext4, fat)

Example

Mount the sandbox host filesystem:

=> mount hostfs /host
=> mount
/host                hostfs

Auto-detect a filesystem on a block device:

=> host bind 0 /tmp/ext4.img
=> mount host 0:0 /mnt
=> ls /mnt
DIR          0 .
DIR          0 ..
        12 testfile.txt

Configuration

The mount command is available when CONFIG_CMD_VFS=y.

Return value

The return value $? is set to 0 (true) if the mount succeeded or the mount list was printed, 1 (false) otherwise.